中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

（Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083）

Abstract:Based on the mechanism of fluid kinetics, the working principle of the vortical loop slot jet nozzle has been studied and analyzed, the results showed that fluid medium projected out from the nozzle does not focus, but forms a hollow double cone. In order to avoid choking up, the stretching length of the leak pipe should be located at such a position that the negative pressure zone of the gas cone is closed.